1.it就是它宾语啊.在这个句子是个代词,指“它”
如果it是形式宾语,这个句子肯定错了.因为buy是及物动词,一定要跟宾语的.
而且,如果是形式宾语,一定是it is worthwhile doing sth.eg.It is worthwhile buying the car.
2.it is 的句子不可以没有宾语.
3.形式主语的句子也不可以没有宾语.
It is important to learn English.
It took me five yuan to buy the pen.